I Think I can top them. Was stood in Disneys Hollywood Studios a few years back, on the benches just along from the Brown Derby, when I over heard a woman asking an employee "Where is the Simpsons ride" the CM was polite and explained it was in another studio Park, the woman looked blank then said "Oh, so where is Jaws then"

Ignoring when I've heard a ride identified incorrectly and when people refer to an attraction by a type, here are some of the best I've heard at the Southern California parks (most of these are technically correct):

I also hear people refer to rides by appearance, such as "The Blue One" or "The Green One" (this is especially common at coaster parks and waterparks). Finally, this ride was before my time, but my mom said everyone used to call Adventure Thru Inner Space "The Monsanto Ride".